initial commit

hydra-smtp.c

@@ -0,0 +1,451 @@
+#include "hydra-mod.h"
+#include "sasl.h"
+
+extern char *HYDRA_EXIT;
+char *buf;
+
+int smtp_auth_mechanism = AUTH_LOGIN;
+
+char *smtp_read_server_capacity(int sock) {
+  char *ptr = NULL;
+  int resp = 0;
+  char *buf = NULL;
+
+  do {
+    if (buf != NULL)
+      free(buf);
+    ptr = buf = hydra_receive_line(sock);
+    if (buf != NULL) {
+      if (isdigit((int) buf[0]) && buf[3] == ' ')
+        resp = 1;
+      else {
+        if (buf[strlen(buf) - 1] == '\n')
+          buf[strlen(buf) - 1] = 0;
+        if (buf[strlen(buf) - 1] == '\r')
+          buf[strlen(buf) - 1] = 0;
+#ifdef NO_RINDEX
+        if ((ptr = strrchr(buf, '\n')) != NULL) {
+#else
+        if ((ptr = rindex(buf, '\n')) != NULL) {
+#endif
+          ptr++;
+          if (isdigit((int) *ptr) && *(ptr + 3) == ' ')
+            resp = 1;
+        }
+      }
+    }
+  } while (buf != NULL && resp == 0);
+  return buf;
+}
+
+int start_smtp(int s, char *ip, int port, unsigned char options, char *miscptr, FILE * fp) {
+  char *empty = "";
+  char *login, *pass, buffer[500], buffer2[500];
+
+  if (strlen(login = hydra_get_next_login()) == 0)
+    login = empty;
+  if (strlen(pass = hydra_get_next_password()) == 0)
+    pass = empty;
+
+  while (hydra_data_ready(s) > 0) {
+    if ((buf = hydra_receive_line(s)) == NULL)
+      return (1);
+    free(buf);
+  }
+
+  switch (smtp_auth_mechanism) {
+
+  case AUTH_PLAIN:
+    sprintf(buffer, "AUTH PLAIN\r\n");
+    if (hydra_send(s, buffer, strlen(buffer), 0) < 0) {
+      return 1;
+    }
+    if ((buf = hydra_receive_line(s)) == NULL)
+      return 1;
+    if (strstr(buf, "334") == NULL) {
+      hydra_report(stderr, "[ERROR] SMTP PLAIN AUTH : %s\n", buf);
+      free(buf);
+      return 3;
+    }
+    free(buf);
+
+    memset(buffer, 0, sizeof(buffer));
+    sasl_plain(buffer, login, pass);
+    sprintf(buffer, "%.250s\r\n", buffer);
+    break;
+
+#ifdef LIBOPENSSL
+  case AUTH_CRAMMD5:{
+      int rc = 0;
+      char *preplogin;
+
+      rc = sasl_saslprep(login, SASL_ALLOW_UNASSIGNED, &preplogin);
+      if (rc) {
+        return 3;
+      }
+
+      sprintf(buffer, "AUTH CRAM-MD5\r\n");
+      if (hydra_send(s, buffer, strlen(buffer), 0) < 0) {
+        return 1;
+      }
+      //get the one-time BASE64 encoded challenge
+      if ((buf = hydra_receive_line(s)) == NULL)
+        return 1;
+      if (strstr(buf, "334") == NULL) {
+        hydra_report(stderr, "[ERROR] SMTP CRAM-MD5 AUTH : %s\n", buf);
+        free(buf);
+        return 3;
+      }
+      memset(buffer, 0, sizeof(buffer));
+      from64tobits((char *) buffer, buf + 4);
+      free(buf);
+
+      memset(buffer2, 0, sizeof(buffer2));
+      sasl_cram_md5(buffer2, pass, buffer);
+
+      sprintf(buffer, "%s %.250s", preplogin, buffer2);
+      hydra_tobase64((unsigned char *) buffer, strlen(buffer), sizeof(buffer));
+      sprintf(buffer, "%.250s\r\n", buffer);
+      free(preplogin);
+    }
+    break;
+
+  case AUTH_DIGESTMD5:{
+      sprintf(buffer, "AUTH DIGEST-MD5\r\n");
+
+      if (hydra_send(s, buffer, strlen(buffer), 0) < 0)
+        return 1;
+      //receive
+      if ((buf = hydra_receive_line(s)) == NULL)
+        return 1;
+      if (strstr(buf, "334") == NULL) {
+        hydra_report(stderr, "[ERROR] SMTP DIGEST-MD5 AUTH : %s\n", buf);
+        free(buf);
+        return 3;
+      }
+      memset(buffer, 0, sizeof(buffer));
+      from64tobits((char *) buffer, buf + 4);
+      free(buf);
+
+      if (verbose)
+        hydra_report(stderr, "DEBUG S: %s\n", buffer);
+
+      sasl_digest_md5(buffer2, login, pass, buffer, miscptr, "smtp", NULL, 0, NULL);
+      if (buffer2 == NULL)
+        return 3;
+
+      if (verbose)
+        hydra_report(stderr, "DEBUG C: %s\n", buffer2);
+      hydra_tobase64((unsigned char *) buffer2, strlen(buffer2), sizeof(buffer2));
+      sprintf(buffer, "%s\r\n", buffer2);
+    }
+    break;
+#endif
+
+  case AUTH_NTLM:{
+      unsigned char buf1[4096];
+      unsigned char buf2[4096];
+
+      //send auth and receive challenge
+      buildAuthRequest((tSmbNtlmAuthRequest *) buf2, 0, NULL, NULL);
+      to64frombits(buf1, buf2, SmbLength((tSmbNtlmAuthRequest *) buf2));
+      sprintf(buffer, "AUTH NTLM %s\r\n", buf1);
+      if (hydra_send(s, buffer, strlen(buffer), 0) < 0) {
+        return 1;
+      }
+      if ((buf = hydra_receive_line(s)) == NULL)
+        return 1;
+      if (strstr(buf, "334") == NULL) {
+        hydra_report(stderr, "[ERROR] SMTP NTLM AUTH : %s\n", buf);
+        free(buf);
+        return 3;
+      }
+      //recover challenge
+      from64tobits((char *) buf1, buf + 4);
+      free(buf);
+
+      buildAuthResponse((tSmbNtlmAuthChallenge *) buf1, (tSmbNtlmAuthResponse *) buf2, 0, login, pass, NULL, NULL);
+      to64frombits(buf1, buf2, SmbLength((tSmbNtlmAuthResponse *) buf2));
+      sprintf(buffer, "%s\r\n", buf1);
+    }
+    break;
+
+  default:
+    /* by default trying AUTH LOGIN */
+    sprintf(buffer, "AUTH LOGIN\r\n");
+    if (hydra_send(s, buffer, strlen(buffer), 0) < 0) {
+      return 1;
+    }
+    if ((buf = hydra_receive_line(s)) == NULL)
+      return 1;
+
+    /* 504 5.7.4 Unrecognized authentication type  */
+    if (strstr(buf, "334") == NULL) {
+      hydra_report(stderr, "[ERROR] SMTP LOGIN AUTH, either this auth is disabled\nor server is not using auth: %s\n", buf);
+      free(buf);
+      return 3;
+    }
+    free(buf);
+    sprintf(buffer2, "%.250s", login);
+    hydra_tobase64((unsigned char *) buffer2, strlen(buffer2), sizeof(buffer2));
+    sprintf(buffer, "%.250s\r\n", buffer2);
+
+    if (hydra_send(s, buffer, strlen(buffer), 0) < 0) {
+      return 1;
+    }
+    if ((buf = hydra_receive_line(s)) == NULL)
+      return (1);
+    if (strstr(buf, "334") == NULL) {
+      hydra_report(stderr, "[ERROR] SMTP LOGIN AUTH : %s\n", buf);
+      free(buf);
+      return (3);
+    }
+    free(buf);
+
+    sprintf(buffer2, "%.250s", pass);
+    hydra_tobase64((unsigned char *) buffer2, strlen(buffer2), sizeof(buffer2));
+    sprintf(buffer, "%.250s\r\n", buffer2);
+  }
+
+  if (hydra_send(s, buffer, strlen(buffer), 0) < 0) {
+    return 1;
+  }
+  if ((buf = hydra_receive_line(s)) == NULL)
+    return (1);
+
+#ifdef LIBOPENSSL
+  if (smtp_auth_mechanism == AUTH_DIGESTMD5) {
+    if (strstr(buf, "334") != NULL) {
+      memset(buffer2, 0, sizeof(buffer2));
+      from64tobits((char *) buffer2, buf + 4);
+      if (strstr(buffer2, "rspauth=") != NULL) {
+        hydra_report_found_host(port, ip, "smtp", fp);
+        hydra_completed_pair_found();
+        free(buf);
+        if (memcmp(hydra_get_next_pair(), &HYDRA_EXIT, sizeof(HYDRA_EXIT)) == 0)
+          return 3;
+        return 1;
+      }
+    }
+  } else
+#endif
+  {
+    if (strstr(buf, "235") != NULL) {
+      hydra_report_found_host(port, ip, "smtp", fp);
+      hydra_completed_pair_found();
+      free(buf);
+      if (memcmp(hydra_get_next_pair(), &HYDRA_EXIT, sizeof(HYDRA_EXIT)) == 0)
+        return 3;
+      return 1;
+    }
+  }
+  free(buf);
+  hydra_completed_pair();
+  if (memcmp(hydra_get_next_pair(), &HYDRA_EXIT, sizeof(HYDRA_EXIT)) == 0)
+    return 3;
+
+  return 2;
+}
+
+void service_smtp(char *ip, int sp, unsigned char options, char *miscptr, FILE * fp, int port) {
+  int run = 1, next_run = 1, sock = -1, i = 0;
+  int myport = PORT_SMTP, mysslport = PORT_SMTP_SSL, disable_tls = 1;
+
+  char *buffer1 = "EHLO hydra\r\n";
+  char *buffer2 = "HELO hydra\r\n";
+
+  hydra_register_socket(sp);
+  if (memcmp(hydra_get_next_pair(), &HYDRA_EXIT, sizeof(HYDRA_EXIT)) == 0)
+    return;
+  while (1) {
+    switch (run) {
+    case 1:                    /* connect and service init function */
+      if (sock >= 0)
+        sock = hydra_disconnect(sock);
+      if ((options & OPTION_SSL) == 0) {
+        if (port != 0)
+          myport = port;
+        sock = hydra_connect_tcp(ip, myport);
+        port = myport;
+      } else {
+        if (port != 0)
+          mysslport = port;
+        sock = hydra_connect_ssl(ip, mysslport);
+        port = myport;
+      }
+      if (sock < 0) {
+        if (verbose || debug)
+          hydra_report(stderr, "[ERROR] Child with pid %d terminating, can not connect\n", (int) getpid());
+        hydra_child_exit(1);
+      }
+
+      /* receive initial header */
+      if ((buf = hydra_receive_line(sock)) == NULL)
+        hydra_child_exit(2);
+      if (strstr(buf, "220") == NULL) {
+        hydra_report(stderr, "[WARNING] SMTP does not allow to connect: %s\n", buf);
+        free(buf);
+        hydra_child_exit(2);
+      }
+      while (strstr(buf, "220 ") == NULL) {
+        free(buf);
+        buf = hydra_receive_line(sock);
+      }
+      free(buf);
+
+      /* send ehlo and receive/ignore reply */
+      if (hydra_send(sock, buffer1, strlen(buffer1), 0) < 0)
+        hydra_child_exit(2);
+
+      buf = smtp_read_server_capacity(sock);
+      if (buf == NULL)
+        hydra_child_exit(2);
+
+      if ((miscptr != NULL) && (strlen(miscptr) > 0)) {
+        for (i = 0; i < strlen(miscptr); i++)
+          miscptr[i] = (char) toupper((int) miscptr[i]);
+
+        if (strstr(miscptr, "TLS") || strstr(miscptr, "SSL")) {
+          disable_tls = 0;
+        }
+      }
+#ifdef LIBOPENSSL
+      if (!disable_tls) {
+        /* if we got a positive answer */
+        if (buf[0] == '2') {
+          if (strstr(buf, "STARTTLS") != NULL) {
+            hydra_send(sock, "STARTTLS\r\n", strlen("STARTTLS\r\n"), 0);
+            free(buf);
+            buf = hydra_receive_line(sock);
+            if (buf[0] != '2') {
+              hydra_report(stderr, "[ERROR] TLS negotiation failed, no answer received from STARTTLS request\n");
+            } else {
+              free(buf);
+              if ((hydra_connect_to_ssl(sock) == -1)) {
+                if (verbose)
+                  hydra_report(stderr, "[ERROR] Can't use TLS\n");
+                disable_tls = 1;
+                run = 1;
+                break;
+              } else {
+                if (verbose)
+                  hydra_report(stderr, "[VERBOSE] TLS connection done\n");
+              }
+              /* ask again capability request but in TLS mode */
+              if (hydra_send(sock, buffer1, strlen(buffer1), 0) < 0)
+                hydra_child_exit(2);
+              buf = smtp_read_server_capacity(sock);
+              if (buf == NULL)
+                hydra_child_exit(2);
+            }
+          } else
+            hydra_report(stderr, "[ERROR] option to use TLS/SSL failed as it is not supported by the server\n");
+        } else
+          hydra_report(stderr, "[ERROR] option to use TLS/SSL failed as it is not supported by the server\n");
+      }
+#endif
+
+      if (buf[0] != '2') {
+        if (hydra_send(sock, buffer2, strlen(buffer2), 0) < 0)
+          hydra_child_exit(2);
+
+        free(buf);
+        buf = smtp_read_server_capacity(sock);
+
+        if (buf == NULL)
+          hydra_child_exit(2);
+      }
+
+      if ((strstr(buf, "LOGIN") == NULL) && (strstr(buf, "NTLM") != NULL)) {
+        smtp_auth_mechanism = AUTH_NTLM;
+      }
+#ifdef LIBOPENSSL
+      if ((strstr(buf, "LOGIN") == NULL) && (strstr(buf, "DIGEST-MD5") != NULL)) {
+        smtp_auth_mechanism = AUTH_DIGESTMD5;
+      }
+
+      if ((strstr(buf, "LOGIN") == NULL) && (strstr(buf, "CRAM-MD5") != NULL)) {
+        smtp_auth_mechanism = AUTH_CRAMMD5;
+      }
+#endif
+
+      if ((strstr(buf, "LOGIN") == NULL) && (strstr(buf, "PLAIN") != NULL)) {
+        smtp_auth_mechanism = AUTH_PLAIN;
+      }
+
+
+      if ((miscptr != NULL) && (strlen(miscptr) > 0)) {
+
+        if (strstr(miscptr, "LOGIN"))
+          smtp_auth_mechanism = AUTH_LOGIN;
+
+        if (strstr(miscptr, "PLAIN"))
+          smtp_auth_mechanism = AUTH_PLAIN;
+
+#ifdef LIBOPENSSL
+        if (strstr(miscptr, "CRAM-MD5"))
+          smtp_auth_mechanism = AUTH_CRAMMD5;
+
+        if (strstr(miscptr, "DIGEST-MD5"))
+          smtp_auth_mechanism = AUTH_DIGESTMD5;
+#endif
+
+        if (strstr(miscptr, "NTLM"))
+          smtp_auth_mechanism = AUTH_NTLM;
+
+      }
+
+      if (verbose) {
+        switch (smtp_auth_mechanism) {
+        case AUTH_LOGIN:
+          hydra_report(stderr, "[VERBOSE] using SMTP LOGIN AUTH mechanism\n");
+          break;
+        case AUTH_PLAIN:
+          hydra_report(stderr, "[VERBOSE] using SMTP PLAIN AUTH mechanism\n");
+          break;
+#ifdef LIBOPENSSL
+        case AUTH_CRAMMD5:
+          hydra_report(stderr, "[VERBOSE] using SMTP CRAM-MD5 AUTH mechanism\n");
+          break;
+        case AUTH_DIGESTMD5:
+          hydra_report(stderr, "[VERBOSE] using SMTP DIGEST-MD5 AUTH mechanism\n");
+          break;
+#endif
+        case AUTH_NTLM:
+          hydra_report(stderr, "[VERBOSE] using SMTP NTLM AUTH mechanism\n");
+          break;
+        }
+      }
+      free(buf);
+      next_run = 2;
+      break;
+    case 2:                    /* run the cracking function */
+      next_run = start_smtp(sock, ip, port, options, miscptr, fp);
+      break;
+    case 3:                    /* clean exit */
+      if (sock >= 0) {
+        sock = hydra_disconnect(sock);
+      }
+      hydra_child_exit(0);
+      return;
+    default:
+      hydra_report(stderr, "[ERROR] Caught unknown return code, exiting!\n");
+      hydra_child_exit(0);
+    }
+    run = next_run;
+  }
+}
+
+int service_smtp_init(char *ip, int sp, unsigned char options, char *miscptr, FILE * fp, int port) {
+  // called before the childrens are forked off, so this is the function
+  // which should be filled if initial connections and service setup has to be
+  // performed once only.
+  //
+  // fill if needed.
+  // 
+  // return codes:
+  //   0 all OK
+  //   -1  error, hydra will exit, so print a good error message here
+
+  return 0;
+}